The sisters took to Snapchat to document the grueling routine, which included squats, TRX, weights and rope lifting.

“Back at it,” Khloé, 32, captioned a video of her two siblings hard at work.

Khloé Kardashian/Snapchat

Kourtney, 37, also uploaded a shot of the equipment they were using that day: “Today’s torture,” she wrote. She also took to her website and app to share her workout playlist which features tracks from Kanye West and Tyga.

“If there is one thing that gets me through a workout, (besides having Khloé by my side) it’s good music! I love to blast ’90s pop, rap and Kayne to get me pumped up for a serious exercise session,” Kourtney wrote.